Automatically-threading loom shuttle



Feb. 10-, 1931. H. A. DAVIS AUTOMATICALLY THREADING LOOM SHUTTLE I Filed May 1. 1930 Patented Feb. 10, 1931 UNITED STATES) PATEfiT OFFICE HARRY A. DAVIS, F HOPEDALE, MASSACHUSETTS,'ASSIGNO-R TO'DRAPER COR?ORA I TION, 0F HOPEDALE, MASSACHUSETTS, A CORPORATION OF MAINE AUTOMATICALLY-THREADING LooM SH UTTLE Application filed May 1, 1930 Serial No. 448,817.

associated with the shuttle during weaving.

In the patent to Hutchins, No. 1,723,423,

' August 6, 1929,'there is shown and described a thread tensioning mechanism comprising two members normally under the lnfluence IQ of resilient means tending to separate the members showing in section the pivotal con.- nection of the tensioning members with they two members to tension and take up slack in the thread. The tensioning members described in the above-mentioned patent have their end portions pivoted to the opposite walls of the shuttle recess or thread passage and intermediate the end portions of each tensioning member there are bends and thread engaging portions which act under the resilient means to take up slack in the thread and maintain substantially uniform tension.

During the weaving operation the shuttle is subjected to sudden impulses during the picking movement and then a sudden stoppage of the shuttle as it finishes its flight and is arrested in the opposite shuttle box. These conditions have at times caused the pivotal end portions ofthe tensioning members to be thrown from their pivotal connection with the opposite walls of the thread passage,

and one of the purposes of the present invention is to provide a guard which shall overcome this difliculty and maintain the pivoted tensioning members properly associated with the shuttle. p

The invention and novel features thereof will best be made clear from the following description and the accompanying drawings of one good form thereof.

In the drawings:

Fig. 1 is a top side perspective view of a shuttle containing the present invention, some of the parts being broken away for clearness of illustration; and a Fig. 2 is a cross-section of'the shuttle at the forward end portion of the tensioning side walls of the shuttle recess or thread passage. I q:

The shuttle isof the automatically replenishing type in which the filling carrieror bobbin is changed fromtime to time and wherein the shuttle becomes threaded during its picking movements. Such shuttles are usually provided with a longitudinal thread passage or recess at the threading end of the shuttle beyond the bobbin chamber, and ordinarily a threading block is provided to facilitate the entrance of the thread tothe longitudinal thread passage on replenishment of filling.

The shuttle 1 is provided withthe bobbin chamber 2 and frontward of the bobbin chamber is the recess or thread passage 3 which communicates wit'h the side delivery eye 4, as usual in this type of shuttle. Overhanging the thread passage is the threading block 5 having a down-turned portion 6 sep-' arated from the opposite wall of the thread passage to enablethe thread to pass into the longitudinal thread passage'on replenishment of filling, and these parts may be of the 'usual character.

The thread tensioning' members may be of the same general character as more fully shown and described in the Hutchins patent, above noted, and each ofthetensioning members 7 and 8 is provided with the thread engaging portions ,9, 10, andbetween the thread engaging portions 9 of the, tensioning member 7 there is" a loop 11 extending towards the. adjacent end of the shuttle, and similarly, there is a frontwardly extending loop'12 on the other tensioning member 8, substantially in all respects the same as int-heHutchins patent. I a, Each of the tensioning members 7 and 8 has itsends pivotally mounted in the opposite sidewalls. of the threadpassage, preferablyin blocks 13 and 14, so that they may move about their pivotal connection with the shuttle under the pull of the thread and act yieldingly :upon the thread through the resilient means, such as the rubberband 15, to take up slack.

Adjacent the pivotal, points of the tensioning members each is provided with an. v

offset portion, that is, from the pivotal point of each tensioning. member a limb ofthat memberis turned towards the bobbincham- Hil ber thereby forming an ofi-set adjacent each pivot. Such off-set portion of the tensioning member 7 at one side of the bobbin chamber is shown at 16, while at the opposite side of the bobbin chamber adjacent to the opposite pivot the o-fi-set of said tensioning member is indicated at 19. Likewise, the tensioning member 8 has an ofii-set portion l8adj'acent" one pivot of said-member and an off-set portion 17 adjacent the opposite pivot. construction thus briefly described may be the same in all respects as shown and described in the Hutchins patent.

In applying the tensioning'members to the shuttle the pivotal end portlons thereof are sprung mwardly and then inserted in a recess in the blocks 13, 1d all as is more fully described in the 'Hutchins patent.

' Inaccordance with the present invention, a guard is provided which overlies the ofi set portions of the two tensioning members adj acent their respective pivots, and, as shown 1n thepresent lIlStELIlCG' of the nvention, the guard comprisesja loop port on'20 which may be secured to the shuttle at one side of the longitudinal thread passage by a screw or bolt 21. 'Exten'ding downwardly from the upper portion of the guard is a leg'22 which, as indicated, overlies the offset portions" 17 .and 19 of the two tensioning members adjathat all danger of the tensioning members.

becoming detached from. the shuttle during weaving is obviated.

In the present instance of the invention, the two leg members 22 and 23 of the guard are connected at 24 by a bridge which extends below the pivotal mounting of the two tensioning members, and in order that the guard containing the leg portion 23 maybe held in operative relation with the off-set portions 16 and 18' of the tension'ing members and offer no obstruction to the thread during the shuttle threading operation, the upper end of the leg portion 23 is turned outwardly at 25 and then extended downwardly on the side of the off-set portions 16 and 1 8 remote from the leg 23, and at its lower portion. the bend 25 is entered into a recess inthe lower wall of the shuttle, as at 26;"

Thus, during the weaving operation, not- 7 withstanding the shocks to which the shuttle is subjected, the pivotal ends of the two tensioning members are prevented from disen- The from a part of the guard. Such supportingportion' of the guardis indicated at 29 and consists of a leg portion having the supporting bends 30 and 81 about which the loop of the band 15 passes and by which the band may be supported in its tensioningposition. As set forth inthe Hutchins patent, the resilient band 13 passes under a bend of the tensioning member 8 and over a corresponding bend in the tensioning member 7, with the result that there is a normal tendency of separation between the tensioning members, as indicated. in Fig. 1.

Should"thepivotal mounting of one or the other ofthe tensioning members become detached from the shuttle duringweaving, the entire function of the tensioning members is destroyed, and the present invention prothreadtensioning member pivotally-inount'ed at its ends at opposite sides of the threadpassage and provided with an off-set adjacent each pivot, a guard secured'to the shuttle and having leg portions, one at'each side of the thread passage, overlying the off-sets of the pivoted tensionlng member to prevent dis engagement of the pivots from the shuttle during weaving.

2. An automatically threading loom shut tle having a bobbin chamber, a longitudinal thread passage and side delivery eye, thread tensioning members pivoted in the longitudinalpassage and each havingan oif-s'et portion adjacent its pivot, and' a guard secured to the shuttle and havinga leg portion overlying'the two ofi set portions ofthe tensioning members adjacent the pivots'thereof to prevent accidental detachment of the pivots from the shuttle during weaving.

3. An automatically threading loom shuttle having, a forwardly extending- .thread passage and a side delivery eye communicating therewith, a pair of" thread tensioning members pivoted at their ends inthe opposite sidewalls of said passage and each provided with an oft-set bend adjacent its pivots, and a guard constitutedas a leg secured at each side of the thread passage and overlying the off-set bendsi of the tensioning members to prevent accidental detachment of the pivots from the shuttle during weaving.

4. an automatically threading loom shuttl'e having a bobbin chamber, a longitudinal thread'pas sage, and a side delivery eye, thread tensioning members having their ends pivotice ally mounted at opposite sides of the longitudinal passage, and a pivotguarding leg extending upwardly at each side of the thread passage over the pivotal portions of the tensioning members to prevent accidental detachment of the pivotal portions of said tensioning members from the shuttle during weaving.

5; An automatically threading loom shuttle having a longitudinal thread passage and a side delivery eye, a pair of thread tensioning members pivotally mounted in the opposite Walls of the thread passage andhaving thread engaging loops, a guard secured to the shuttle and having pivot guarding leg portions, one at each side of the longitudinal thread passage, overlying the side portions of the tensioning members adjacent their pivots to prevent disengagement of the latter from the shuttle during weaving.

6. An automatically threading loom. shuttle having a longitudinal thread passage, a thread tensioning member pivotally mounted at its ends at opposite sides of the thread passage and provided with an ofi-set adjacent each pivot, a guard secured to the shuttle and having leg portions, one at each side of the thread passage, overlying the off-sets of the pivoted tensioning member to prevent disengagement of the pivots from the shuttle during weaving, and a bridge connecting the two leg portions of the guard.

7. An automatically threading loom shut- V tle having a bobbin chamber, a longitudinal the opposite side of the thread passage overlying the adjacent otf-set portion of the tensioning member, and a bridge connecting the two legs of the guard below the pivots of the tensioning member. 7

8. An automatically threading loom shuttle having a bobbin chamber, a longitudinal thread passage and side delivery eye, a thread tensioning member having its ends pivotally mounted at opposite sides of the threadpas- 1 age and having intermediate bends for engagement with the thread and an oflf-set adj acent each pivot, yielding means acting on the tensioning member to take up slack, a fixed guard having a leg at one side of the thread ing member, and a support for said yielding means constituted as part of the guard.

9. An automatically threading loom shuttle having a bobbin chamber, a longitudinal thread passage and a side delivery eye, a

thread tensioning member having its ends pivotally mounted at opposite sides of the thread passage and having an intermediate portion for engagement with the thread and an offset adjacent the pivot, a fixed. guard having a leg at one side of the thread passage overlying the adj aoent ofiset portion of the tensioning member to prevent disengagement of the pivot of the tensioning member from the shuttle, yielding means acting on the tensioning member to take up slack in the thread, and a support for the yielding means constituted as part of the guard.

In testimony whereof, I name to this specification.

HARRY A; DAVIS.

have signed my passage overlying the adjacent off-set pori tion of the tensioning member, a leg at the the guard below the pivots of the tension- 

